Improvement in hub-boring machine



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ALBERTYRKSILVER, OF SALEM, OHIO.-

Lciters Patent No.V 105,265, dated yJuly 12, 1870. f

IMPROVEMENT 1N :rms-BORING MACHINE. i

The Schedule referred to in these Letters Patent and making part of the same ,To all whom it may concern Be it known that I, ALBERTR. SrLVnR, of Salem, i-n the county ot' Columbiana and State of Ohio, have invented a'new and improved Hub-boxingv Machine; and I do hereby declare that the'following is a iull, clear, and exact description thereof, reference being had to the accompanyingdrawing making part of this specication, in whiclr- Figurcil, plate I, is a side view of the limproved machine, showinga hub conl'ined in'place between the chucks, and the mandrel adjusted l'or boring a taper hole.

Figure 2, plate 1, is al diametrical section through tig. 1.

Figures 3 and 4 are views of the feed-nut and its spherical head.

Figures 5 and 6 are views of the gauge-collars for the mandrel.

Figures 7,-8, 9, and 10,' plate 2, are diixrcut views of' the larger chuck and its attachments.

' .Figure 1l, plate 3, is an inside view of the smaller chuck and its attachments.

Figure 12, plate 3, shows the scale or graduated rule, which isused to adjust the bit on the mandrel, applied to the mandrel, which latter' is shown by crosssection.

Similar letters of reference indicate corresponding partsy in the several ligures.

The object of this invention'is to improve vthat class of hand hub-boring machines, lwherein self-centering chucks are employed for -centering and griping the hubs, and supporting and guiding .the mandrel which carriesthe cutting-bits.

To enable others skilled in the ar't vto understand my invent-ion, I will describe its construction and operation. v

' In the accompanying drawing, figs. l and 2, I have represented a hub, A, confined and centered between two chucks, in position for being bored, and, in` the same figures the mandrels are represented as'adj usted for boring-a taper hole centrally through the hub.l

The chuck, which is adapted for being applied to the largest end of the hub, consists of three radially movable griping-jaws a, arranged equidistant apart, and applied, by means ot' grooved racks c', tothe radially-slotted arms 1), as clearly shownin iigs. 1, 2, 9, and 10. l

l These slotted ar'ms D are constructed upon the circumference of a ring, DZ, the cylindrical collar W of which is received into a circular opening made'ceutrally through thecircular chuclcplate B, and held in place by means of a ring-cap, h, which is secured to said collar, as slrowu in ligs. 7 and 10.

Ou the inner side of the chuck-platel, a scrollthread, t, is formed, which engages with the teeth onl the grooved racks a. of the griping-jaws, and moves4 these jaws either toward or from the centerol thc clrrrclcplate, when the latter is turned, andthe arms D held stationary, as in the act of eonlining or releasing a hub.

llhe sockets or perbrated bosses d, on-the circumference' of the chuck-plate B, are intended for receiving a rod or handle, 'which serves as a lever, and assists in the adjustment ofthe griping-jaws. G is a circular plate, which is co'nlined- Ain place by means of the cap-ring lr, but allowed to turn freely. This plate G islapplied in the center of the chuckplate l, and constructed with a large opening, 0, through it, ou one side of its center', tlrrouglrvy'vhich opening the operator can inspect the work as it progresses. r

Another opening, n, of an` oblong forni, is made centraily through `plate G, through which the mandrel E passes, as shown in tig. 2'. This oblong opening 'n allows the mandrel to bc adjusted'fbrboring any desired degree of taper'.` lo the outer surface of the plate G, and secured te -it bymeans of a set-screw, j, and a tongue and groove,

is a plate, H, through which the mandrel E passes, and to which this mandrel is connected by means ot' afeatl1er,'v, on the plate H, litting into a longitudinal groove in 'the mandrel. llre mandrel E is thus allowed free longitudinal and rotary movements, but, in its rotary movements, it carries with it the two plates G and II.'

The plate H has an oblong opening through it, through whichthe sct-screwj passes, so that, by loos\ cning this screw, the said plate can be adjusted in a direction'witlr the length ofthe opening n. llris adjustment allows the mandrel to besct for boring any desired degree of taper in hubs, or to be set exactly in the center' ofthe chuck-plate ibrshouldering the hubs.

It will be seen, by reference to g. 7, that a scale, S, is marked on the outer face of the rotary plate G,

and that a pointer is applied to the edge of the adj ust able pla-te H, so as to point at tliemarks of thescalc. This scale audpointcr is. designed to afford facility ot' accurate adjustment of the mandrel for boring taper' holes, by indicating at a glance the amount ot` adjustment ot'plate H for a given degree of taper. y

The chuck, which is adapted for the smaller' ends of hubs, consists, mainly, ota circular centrally-perlor'ated plate, C, having a scr'oll-screw, p, on its inner' side, which engages with the teeth on the grooved racks b of gr'iping-jaws b.

lhe racks of, rthe jaws b are applied to and guided by slotted radial arms D1, arranged at equal distances apart around the circumference of a ring or collar, C', as shown in tig. 11, plate 3.

The cylindrical position of the collar O is fitted cenrw/v trally into the chuck-plate O, and. connected thereto by the outside'cap-ring c, as shown in fig. 2, plate 1.

It will be seen that the two chucks are constructed substantially alike, as far as the griping and' centering features are concerned. y I

Diametrically across the opening through the collar U' isa bar, P, having a depression, s, its center for receiving part of spherical enlargement y', which -latter is confined in place in its socket s by means of two half-plates l", that are secured to plate I, as shown iulig. 2.

`Ihe ball or enlargement g'is anV extension of the dovetail-grooved plate -which receives the half-nuts -m in a box, F, and this ball, and its attachment to `the chuck, is designed to allowthe feed-nut to have universal motion, or free oscillation of the machine in boring tapering holes.

The groove `fi, wlri Ih is-made in the periphery of the ball g,in a direction parallel tothe opening through this ball,` receives a spring bolt, 1*, which is applied to the cross-bars l I, as shown in figs. 2 and ll, when it is desired to p revent the feed-nut from turning with the mandrel, but, when it is desired to stop the feed of the mandrel, the bolt lr is' retracted and held back hyturning fiugerspiece fr against the cud of one of the socket pieces Pf. y

The feed-nut, without the ball-joint, will he found fully described in Letters Patent granted to me, and antedatcd July 25,1868, for a huh-boring machine. Y The screw-threaded portion of the mandrel E passes thl'ough the feed-nut, as shown iuiig. 2, and the feed of this mandrel is produced by the threads on the halfuuts m engaging with `the marnlrel-thread The halfnuts may -he disengaged from the marulrel-tlnead by giving the cap or box F a half turn.

r The stops or gauges f c are adjustable upon the mandrel,`and are constructed with gibs f2 e", and set screws f1 el, by which these stops can be secured tightly to the mandrel at any desired point.

g Operation.

Having secured the chucks to the ends of a hub, and adjusted the mandrel in the center, run one or more cuts through, as `may .be'neeessary, until the hole through the hubis nearly the `size of thc point end of the bore Then, with the side of a rule or scale, K, (which is shown in frff. 12, and which will he hereinafter explained,) marked for straight hole, set

the hit g to cut the size of the point end of the box,

say onesixteenthscant.

'lodo this,rplace the scale S ou the enlarged portion of the mandrel E, close to the bit g, on the side uexttlre hub. Set the end of the bit to the' iigure `or mark on the scale indicating the size ofthe small end of the box, (on the side marked for straight hole.)

For example, suppose the point end of the box to be three inches in diameter. Then, set the bit to ligure 3 on the scale, and in a corresponding manner for other sizes. Now, run a cut through, draw the mandrel back, and `put in a long bit. Set the bit, in thesame manner asrbefore, to cut astraight hole the size of the largest portion of the box, (a little lfull to allow for wed'ging,) adjust the stop or gauge-plate c to cut theshoulder at the required depth, bore until the said stop o'r gauge c comes in contact with `the plate H on revolving disk Gr, then 4release theV mandrel from the feed-uut by separ'ating the two halves of this nut. (It will be observed that the feed-nut is made in two sections or halves, which are readily separated or closed on the mandrel by turning the cap or box 11 lto the right or left, as the case may be, so that the mandrel can be run through either way without turning it, thus saving much time.) This stops the feed, when one turn ct' the mandrel will form a perfectly square shoulder.

This done, and while lthe long bit is inthe ylnandrcl in the center, cut the recess `for the washer on the large end of the hub. Now, put ina smaller` bit, and

4set it (using that part of the scale marked for taper hole) to cut the size of the' point end of the box; then adjust the mandrel over' a little for each cnt, and run through as many cuts las may be necessary tof make the hole at the shoulder nearly as large as the largest taper-portion of the box. Now, before making the last cut,lascer'tain the exact point on the scale S to which themandrel must bc setl to make the last ent the required size to fit the tapcr'of the box. This point is determined as follows First, ascertain how much the box tapers to the inch; then find the distance from center to center of thc circumference of the scroll-plates, as the machine stands on the lrnb, (orfromI the inside of one to the outside of the other, which is the saure.) Now, if the `box tapers one-eghthto the iuch,'which is the usual taper, set the mandrel over one-sixteenth of an inch for every iuclr of distance between the scroll-plates, as

above, and in the same proportion for any other taper'. t

For example, if the box' tapers one-sixteenth to the v inch, then set the mandrel over onethirtysecond to vthe inch of distance between the chuck-plates.

Havingjset the mandrel to theexact point, as indicated by theV above rule, run the last cnt through then 'set the mandrel back to the center, reverse th bit,

and set-'it (bythe side of the scale marked forstraight hole) to cut the required size for the recess to receive the nut on the end' of the axle, with the bit resting against the lrnb. Set'the gauge or stop f back from the cap of thefeed-nut thel proper distance to cut the` recess the required depth. 'lhen,by turning the mandrel to the left, run inuntil the gauge j' comes lin contact with the cap of the 'eedmut. Free the feed-nut by fastening .back the spring bolt 'fr so that this' nut l will revolveV with the mandrel, when one turn will make a 'perfectly square shoulder at thebottom of the recess, the whole operation being conducted with'out removing th'e machine-from the huh. i

The rule or scale K, abovclreferred to, is a thin plate of metal, of anysuitable length, having one cud scored to fit on the enlarged portion ofthe mandrel,

' and having marks 'made on it, properly graduated, for

both the straiwht boring and taper boring. "Ilris rule is adjusted up ln the mandrel, and against the bit, as shown in figli, and lthe hit set according'to figures marked on 'the scale, indicating the adjustment sought under this application. v

I 'do not claim the marmer of constructing 'these parts of the chuck-plates which effect the clamping of Ithe hubs. and the centering ofthe same, .as these features are shown in'. patents previously granted;`

Nor do I claim, under this application, any of the features shown in Lettcrsllatent numbered, respeety ively, 11,364., 53,216, and 80,837; and, while I prefer to adopt the clamping and centering devices herein described, I do not confine my invention to their use, as other forms of clamps rrray be employed.

Having described my invention,

What I claimas new, and desire to secure byvLet 1. In combination with a boring-shaft, having a spherical bearing, g', in one of the scrollchuck-plates, and a sliding bearing in the other scroll chuck-plate,

the detachable cap-ring plate @ring-collar C','radial t forkedl guide-arms Dl, and gr'iping-jaws b b, in the manner shown and described. I, r

2; 'lhe ring-collar G', platev I?, and removable plates I P', constructed as described, iu combination with the spherical enlargement 1/of thc nut, all substantially as set forth.`

3. The nut F, 4provided with the 'spherical enlarge nient g', substantially as described.

structed wit-h the oblong opening n, and scale S,

slotted and conwally-perforated bearing and indicating-plate H r, and screw j, n'll arranged as herein shown and described. Y v

' ALBERT R. SILVER.

Witnesses EDGAR L. VIcKEns,

R. H. G-ARRIGUES. 

